Is it hard?

Me and my boyfriend are going on three years now and since the beginning I've known he wanted to join the army. Now that he has actually got the paperwork and started filling it out, I'm not sure if I can handle it. We live an hour away and see each other once a month; if we're lucky maybe twice a month. Now we're talking months of not seeing each other. In the beginning, how did you cope and stay strong?